A Catalytic Particulate Filter for Diesel Engines Coated with Cezrk/RGO Nano Solid Solution Catalyst

A particle trap and solid solution technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, nanotechnology, etc., can solve the problem of high catalyst cost, achieve good catalytic activity and improve efficiency , the effect of simple structure

Active Publication Date: 2021-10-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the exhaust temperature of the diesel engine is between 150°C and 450°C. The temperature at which the soot oxidation in the above invention reaches the maximum rate is 416°C. Although it has fallen into the range of the exhaust temperature of the diesel engine, it is in a relatively high range, and the catalytic activity There is still room for improvement
Since the time-loaded alloy catalyst and the carrier are cerium-zirconium composite oxide and its light rare earth modification system, the alloy-type active component is a homogeneous palladium-silver alloy, resulting in a relatively high cost of the catalyst

Method used

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  • A Catalytic Particulate Filter for Diesel Engines Coated with Cezrk/RGO Nano Solid Solution Catalyst
  • A Catalytic Particulate Filter for Diesel Engines Coated with Cezrk/RGO Nano Solid Solution Catalyst
  • A Catalytic Particulate Filter for Diesel Engines Coated with Cezrk/RGO Nano Solid Solution Catalyst

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Embodiment 1

[0054] A catalytic particle filter for diesel engines coated with CeZrK / rGO nanometer solid solution catalyst, comprising a filter housing 2 and a filter element 21, the filter element 21 includes a substrate and a catalyst; the active component of the catalyst includes CeZrK / rGO nanometer solid solution catalyst.

[0055] Further, the CeZrK / rGO nano solid solution catalyst has a general formula: Ce A Zr B K C / rGO; wherein, in the general formula, A:B:C=5:1~3:1~3.

[0056] The CeZrK / rGO nanometer solid solution catalyst has a nanopore structure, and its pore diameter is 36.1-36.9nm. It is larger than soot (>20nm), which ensures that soot can enter the internal pores of the catalyst and fully contact with the active phase.

[0057] The specific surface area of ​​CeZrK / rGO nano solid solution catalyst is 117.2-152.4m 2 / g. The graphene-based catalyst has a larger specific surface area and better pore structure, which effectively ensures the high catalytic activity of the C...

Embodiment 2

[0069] Such as figure 2 As shown, the present embodiment describes the morphology and size of the CeZrK / rGO nanometer solid solution catalyst using transmission electron microscopy (TEM) technology. It can be seen that the base material of graphene takes the form of translucent flakes with wrinkles and folds. The metal oxide particles supported on graphene are uniform and highly dispersed. From figure 2 can be found in the TEM image, with Ce 5 Zr 1 K 1 / rGO and Ce 5 Zr 3 K 3 / rGO vs Ce 5 Z r2 k 2 / rGO has the most uniform dispersion of metal oxide particles. Ce can be obtained using nanometer measurement software 5 Zr 1 K 1 / rGO, Ce 5 Zr 2 K 2 / rGO, and Ce 5 Zr 3 K 3 The average particle diameters of / rGO are 9.65nm, 7.42nm and 9.39nm, respectively, which are 15-20nm smaller than the average particle diameters of CeZrOx catalysts. This indicates that graphene inhibits the surface migration of metal oxide nanoparticles and reduces the size of metal oxide ...

Embodiment 3

[0073] This example uses N 2 The characteristics of CeZrK / rGO nano solid solution catalyst were analyzed by adsorption-desorption experiment. Figure 4 shows the N of the CeZrK / rGO nano-solid solution catalyst 2 Adsorption isotherm and pore size distribution line graph. Since adsorption and diffusion are key processes in heterogeneous catalytic reactions, the pore structure of CeZrK / rGO nano-solid solution catalysts has a great influence on its catalytic performance. In the IUPAC classification, the similar type IV isotherm with H3 type hysteresis loop indicates that the CeZrK / rGO nano-solid solution catalyst is characterized by mesoporous distribution. exist Figure 4 As can be seen from b, d and f of 5 Zr 1 K 1 / rGO, Ce 5 Zr 2 K 2 / rGO and Ce 5 Zr 3 K 3 The most likely pore diameters of / rGO are 36.9nm, 36.8nm, and 36.1nm, respectively, which are larger than soot (>20nm), which ensures that soot can enter the internal pores of the CeZrK / rGO nano-solid solution cat...

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Abstract

The invention discloses a catalytic particle trap for diesel engines coated with CeZrK / rGO nanometer solid solution catalyst, comprising a filter housing and a filter element, the filter element including a substrate and a catalyst; the active component of the catalyst includes CeZrK / rGO nanometer solid solution catalyst. Because the CeZrK / rGO nano solid solution catalyst has the characteristics of large specific surface area, high oxygen content, low reaction temperature, good thermal stability, reproducibility and low cost, the present invention has the characteristics of strong soot filtering effect, reproducibility and low cost. .

Description

technical field [0001] The invention specifically relates to a catalytic particulate trap for diesel engines coated with CeZrK / rGO nanometer solid solution catalyst. [0002] technical background [0003] Diesel engines have been widely used in transportation vehicles and various non-road construction machinery, and are not uncommon in life. However, the exhaust gas from diesel engines will cause serious pollution to the environment and have a great impact on human health, especially the soot emitted by diesel engines can enter the blood, trigger gene mutations and cause health risks. In recent years, with the increasingly stringent emission regulations, the soot emission control technology of diesel engines has become the focus. [0004] The exhaust temperature of a diesel engine is between 150°C and 450°C, while the oxidation temperature of soot exceeds 550°C. This causes the soot to fail to fully oxidize, resulting in a large amount of soot emitted by the diesel engine o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/035F01N11/00B01J23/10B01J35/10B82Y30/00B01D53/94B01D53/62
CPCB01D53/62B01D53/94B01D2258/012B01J23/10B01J35/023B01J35/1019B01J35/1061B82Y30/00F01N3/035F01N11/002Y02T10/40
Inventor 李玉强吴钢
Owner CENT SOUTH UNIV
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